I've been lucky enough, or such like, to have found myself given a fully specced up defender. Now i'm familiar with SPTA from an army point of view (being in the TA), but i was just wondering what the rules were about off-roading from a civvie point of view on the land?

Obviously i wouldn't want to go pissing off the wardens etc, just wondering if joe bloggs was allowed to utilise the plain for a bit of harmless mud churning.... granted i probably wouldn't want to go into the x-country training area without some kind of back up plan.

I think you are on a loser here, SPTA Staff and LAND are in a constant battle with the environmentalist types!
To the extent that Sat Images are being produced to show how much Greenery is being trashed by Tracked vehicles. Hence the stick to tracks whenever possible rule!
The Range staff RE WO1 at SPTA L** Fr***H is a good bloke to get in touch with and will probably be able to tell you about clubs if any that have got privileges!
Good Luck!!